Re: How to gap a Spark Plug?
DO NOT TAP THE SPARK PLUG ON A HARD SURFACE TO CLOSE THE GAP !!!!!
Please, .....the proper way to close (or open) the gap on a spark plug is to use the spark plug electrode wrench fixture....usually found on a spark plug gapping tool.
After placing the slotted end of the tool on the plug electrode GENTLY and SLOWLY apply pressure and bend the elctrode in the appropriate direction. DO NOT HOLD or make contact with the WHITE insulator while doing this.
The white porcelin (think glass) insulator is fragile. Dropping or banging it will produce microscopic hairline cracks, which will cause electrical shorts, abehrrent current paths, loss of power and premature failure.
The 1st RULE of race mechanics is:
IF you drop a spark plug... throw it away!
IF you bang it on a hard surface the Rule applies!